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Fardh Kifaya - It is the Fard, that if performed by some (a sufficient number), the obligation falls from the rest

Example: A group of Muslim brothers meet another group on the way to the masjid. It is their duty to convey the 'Salaam' to the other, and so if "one" brother amongst them was to convey the 'Salaam' then insha'allah ta'ala the rest will be relieved of this duty.

Fardh 'Ayn -It is the Fard that is a compulsory duty on every single Muslim to perform, [just] like praying and fasting.

Allah the Almighty, and Majestic says:

“And fight them until there is no more Fitnah (disbelief and polytheism:i.e. worshipping others beside Allah) and the religion (worship) will all be for Allah alone (in the whole world)...“
(Surat al Anfal : Verse 39)

The Fitnah referred to in this ayah means Shirk as Ibn 'Abbas (radiallaahu 'anhu) and Siddi said:

“When the Kufaar attack and control a [Muslim] country, the Ummah is endangered in its Religion, and it becomes susceptible to doubt in its belief. Fighting [the Kufaar] then becomes an obligation, to protect the Religion, the lives, the land and wealth.”

Elaborated at the link following, from the Book "Defence of the Muslim Lands" By Shaheed Dr. Abdullah Yusuf Azzam (rahimahullah)

Fardh Kifaya - It is the Fard, that if performed by some (a sufficient number), the obligation falls from the rest

Example: A group of Muslim brothers meet another group on the way to the masjid. It is their duty to convey the 'Salaam' to the other, and so if "one" brother amongst them was to convey the 'Salaam' then insha'allah ta'ala the rest will be relieved of this duty.

Fardh 'Ayn -It is the Fard that is a compulsory duty on every single Muslim to perform, [just] like praying and fasting.

Allah the Almighty, and Majestic says:

“And fight them until there is no more Fitnah (disbelief and polytheism:i.e. worshipping others beside Allah) and the religion (worship) will all be for Allah alone (in the whole world)...“
(Surat al Anfal : Verse 39)

The Fitnah referred to in this ayah means Shirk as Ibn 'Abbas (radiallaahu 'anhu) and Siddi said:

“When the Kufaar attack and control a [Muslim] country, the Ummah is endangered in its Religion, and it becomes susceptible to doubt in its belief. Fighting [the Kufaar] then becomes an obligation, to protect the Religion, the lives, the land and wealth.”

Elaborated at the link following, from the Book "Defence of the Muslim Lands" By Shaheed Dr. Abdullah Yusuf Azzam (rahimahullah)

3:103 And hold fast, all together, unto the bond with God, and do not draw apart from one another. And remember the blessings which God has bestowed upon you: how, when you were enemies, He brought your hearts together, so that through His blessing you became brethren; and [how, when] you were on the brink of a fiery abyss. He saved you from it. In this way God makes clear His messages unto you, so that you might find guidance.